Megaton Rainfall

Megaton Rainfall is a First Person Superhero Game. You control an indestructible interdimensional superbeing with an immense destructive power and faster-than-light flying capabilities, and your mission is to save the Earth from an alien invasion.
Accelerate from 0 to mach 10 in 5 seconds, fly around a real-size-Earth, get out of the atmosphere, the solar system and even the Milky Way in less than 1 minute from any location. You can destroy entire skyscrapers (unintentionally) when you miss your target... Just like the aliens, if you let them to do so.